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The effects of phase transformation on the microstructure and mechanical behavior of FeNiMnCr.sub..75Al.sub. x high-entropy alloys.(Report)

Li, Rongbin ; Zhang, Weiwei ; Zhang, Yong ; Liaw, Peter K.

Materials Science & Engineering A, May 16, 2018, Vol.725, p.138 [Tạp chí có phản biện]

ISSN: 0921-5093 ; DOI: 10.1016/j.msea.2018.04.007

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  • Nhan đề:
    The effects of phase transformation on the microstructure and mechanical behavior of FeNiMnCr.sub..75Al.sub. x high-entropy alloys.(Report)
  • Tác giả: Li, Rongbin ; Zhang, Weiwei ; Zhang, Yong ; Liaw, Peter K.
  • Chủ đề: Crystal Structure – Analysis ; Alloys – Analysis ; Annealing – Analysis
  • Là 1 phần của: Materials Science & Engineering A, May 16, 2018, Vol.725, p.138
  • Mô tả: Keywords High-entropy alloy; Phase transformation; Mechanical behavior; Annealing Abstract The effects of phase transformation on the microstructures and mechanical behavior of FeNiMnCr.sub..75Al.sub.x (x = 0.25, 0.5 and 0.75) high-entropy alloys (HEAs) were investigated. The crystal structures of the FeNiMnCr.sub..75Al.sub.x HEAs transitioned from the primary FCC1 and minor BCC (x = 0.25) to primary BCC and minor FCC2 (x = 0.5 and 0.75) phases. TEM images of the as-cast FeNiMnCr.sub..75Al.sub.x (x = 0.25, 0.5 and 0.75) alloys showed the BCC precipitates embedded in the FCC matrix phase. After annealing, two substantial phase transitions occurred for the x = 0.25 and 0.5 alloys from the BCC phase to the [sigma] phase and between the FCC2 phase and the FCC1 phase, effectively increasing the yield strength and sharply reducing the strain. The yield strength of the FeNiMnCr.sub..75Al.sub..25 alloy greatly increased from 450.5 MPa (as-cast) to 945.0 MPa (annealed at 900 [degrees]C), but the strain sharply decreased from above 60% (as-cast) to 24.3% (annealed at 900 [degrees]C). Meanwhile, annealing had no obvious effect on the phase transition of the FeNiMnCr.sub..75Al.sub..75 alloy. In addition, the correlation between the phase transformation BCC - [sigma] phase and FCC2 - FCC1 was also investigated. This investigation provided a promising way to achieve phase-stable HEAs. Author Affiliation: (a) Institute of Materials Science, Shanghai Dian Ji University, Shanghai 201306, China (b) School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China (c) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China (d) Department of Materials Science and Engineering, the University of Tennessee, Knoxville, TN 37996, USA * Corresponding author at: Institute of Materials Science, Shanghai Dian Ji University, Shanghai 201306, China. Article History: Received 28 January 2018; Revised 2 April 2018; Accepted 3 April 2018 Byline: Rongbin Li [842363159@qq.com] (a,b,*), Weiwei Zhang (a), Yong Zhang (c), Peter K. Liaw (d)
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0921-5093 ; DOI: 10.1016/j.msea.2018.04.007

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